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MM Two-digit month of the year. SELECT SYSDATE, TRUNC SYSDATE, 'MM' , ROUND SYSDATE, 'MM' FROM dual; SYSDATE TRUNC SYSDATE,'MM' ROUND SYSDATE,'MM' -------------------- -------------------- -------------------- 16-JUL-2004 08:15:31 01-JUL-2004 00:00:00 01-AUG-2004 00:00:00 1 row selected. Look at what happens when you just do straight subtraction of the columns in.

Each of the two has strengths in simplicity and granularity. SELECT SYSDATE, TRUNC SYSDATE, 'HH' , ROUND SYSDATE, 'HH' FROM dual; SYSDATE TRUNC SYSDATE,'HH' ROUND SYSDATE,'HH' -------------------- -------------------- -------------------- 08-JUL-2004 08:36:22 08-JUL-2004 08:00:00 08-JUL-2004 09:00:00 1 row selected. It records a deposit to an account at 11 a.

Convert Oracle Timestamp to Date

If you want to store date and time information in , you really only have two different options for the column's datatype. Lets take a quick look at these two datatypes and what they offer. DATE datatype This is the datatype that we are all too familiar with when we think about representing date and time values. It has the ability to store the month, day, year, century, hours, minutes, and seconds. It is typically good for representing data for when something has happened or should happen in the future. The problem with the DATE datatype is its' granularity when trying to determine a time interval between two events when the events happen within a second of each other. This issue is solved later in this article when we discuss the TIMESTAMP datatype. What needs to be realized when doing the calculation is that when you do subtraction between dates, you get a number that represents the number of days. You should then multiply that number by the number of seconds in a day 86400 before you continue with calculations to determine the interval with which you are concerned. Check out for my solution on how to extract the individual time intervals for a subtraction of two dates. I am aware that the fractions could be reduced but I wanted to show all the numbers to emphasize the calculation. Oracle has expanded on the DATE datatype and has given us the TIMESTAMP datatype which stores all the information that the DATE datatype stores, but also includes fractional seconds. If you want to convert a DATE datatype to a TIMESTAMP datatype format, just use the CAST function as I do. As you can see, there is a fractional seconds part of '. If you are moving a DATE datatype column from one table to a TIMESTAMP datatype column of another table, all you need to do is a straight INSERTSELECT FROM and Oracle will do the conversion for you. Look at for a formatting of the new TIMESTAMP datatype where everything is the same as formatting the DATE datatype as we did in. This is a clear indication that the use of TIMESTAMP datatype should explicitly be used for date and times where a difference in time is of utmost importance, such that Oracle won't even let you compare like values. If you wanted to show the fractional seconds within a TIMESTAMP datatype, look at. In Listing E, we are only showing 3 place holders for the fractional seconds. Look at what happens when you just do straight subtraction of the columns in. As you can see, the results are much easier to recognize, 17days, 18hours, 27minutes, and 43seconds for the first row of output. This means no more worries about how many seconds in a day and all those cumbersome calculations. And therefore the calculations for getting the weeks, days, hours, minutes, and seconds becomes a matter of picking out the number by using the SUBSTR function as can be seen in. This is a great tool for testing date and time sensitive code. Just beware that this parameter has no effect on the SYSTIMESTAMP function. This can be seen in. You have at your disposal the DATE and TIMESTAMP datatypes. Just be aware, while there are similarities, there are also differences that could create havoc if you try to convert to the more powerful TIMESTAMP datatype. Each of the two has strengths in simplicity and granularity.

SELECT SYSDATE, TRUNC SYSDATE, 'W'ROUND SYSDATE, 'W' FROM dual; SYSDATE TRUNC SYSDATE,'W' ROUND SYSDATE,'W' -------------------- -------------------- -------------------- 13-JUL-2004 08:28:10 08-JUL-2004 00:00:00 15-JUL-2004 00:00:00 1 row selected. For difference, if the UTC time is 11:00 a. Values in that interval are invalid. This fraction means a portion of one day. Next we will see how to convert between timestamps and dates. In addition to the datetime elements of the DATE datatype, the TIMESTAMP datatype elements fractions of a second to a precision between 0 and 9 decimal places, the default being 6. The default value is 2. AM or PM A. The time zone offset is the difference in hours and minutes between local time and UTC Coordinated Universal Time, formerly Hiroshima Mean Time. To_date with timestamp in oracle how the default precision for seconds is used because we have not limited it to 3 decimal places. The following table lists a selection of them and examples of their usage.